Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 200/55-18 | 120/70-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.66 (677.2) | 27.61 (701.4) | 0.95 (24.2) 3.6% |
| Width inches (mm) | 7.87 (200) | 4.72 (120) | -3.15 (-80) -40% |
| Circum. inches (mm) | 83.76 (2127.49) | 86.75 (2203.51) | 2.99 (76.03) 3.6% |
| Sidewall Height inches (mm) | 4.33 (110) | 3.31 (84) | -1.02 (-26) -23.6% |
| Revolutions per mile (km) | 756.45 (470.04) | 730.35 (453.82) | -26.1 (-16.22) -3.5% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.71 mph (33.34 km/h) |
| 25 mph (40.23 km/h) | 25.89 mph (41.67 km/h) |
| 30 mph (48.28 km/h) | 31.07 mph (50.01 km/h) |
| 35 mph (56.33 km/h) | 36.25 mph (58.34 km/h) |
| 40 mph (64.37 km/h) | 41.43 mph (66.67 km/h) |
| 45 mph (72.42 km/h) | 46.61 mph (75.01 km/h) |
| 50 mph (80.47 km/h) | 51.79 mph (83.34 km/h) |
| 55 mph (88.51 km/h) | 56.97 mph (91.68 km/h) |
| 60 mph (96.56 km/h) | 62.14 mph (100.01 km/h) |
| 65 mph (104.61 km/h) | 67.32 mph (108.35 km/h) |
| 70 mph (112.65 km/h) | 72.5 mph (116.68 km/h) |
| 75 mph (120.7 km/h) | 77.68 mph (125.01 km/h) |
| 80 mph (128.75 km/h) | 82.86 mph (133.35 km/h) |
| 85 mph (136.79 km/h) | 88.04 mph (141.68 km/h) |
| 90 mph (144.84 km/h) | 93.22 mph (150.02 km/h) |
| 95 mph (152.89 km/h) | 98.39 mph (158.35 km/h) |
| 100 mph (160.93 km/h) | 103.57 mph (166.69 km/h) |
| 2.35 | 2.73 | 2.94 | 3.07 | 3.21 | 3.31 | 3.42 | 3.55 | 3.73 | 3.91 | 4.11 | 4.27 | 4.56 | 4.88 | 5.13 | 5.29 | 5.38 | 5.71 | 6.17 | 7.17 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1859 | 2159 | 2325 | 2428 | 2539 | 2618 | 2705 | 2808 | 2950 | 3092 | 3251 | 3377 | 3606 | 3860 | 4057 | 4184 | 4255 | 4516 | 4880 | 5671 |
Better Fuel Economy Factory Ratios Increased Power
